WO2011107001A1 - 呼叫的处理方法和装置 - Google Patents

呼叫的处理方法和装置 Download PDF

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Publication number
WO2011107001A1
WO2011107001A1 PCT/CN2011/070234 CN2011070234W WO2011107001A1 WO 2011107001 A1 WO2011107001 A1 WO 2011107001A1 CN 2011070234 W CN2011070234 W CN 2011070234W WO 2011107001 A1 WO2011107001 A1 WO 2011107001A1
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Prior art keywords
call
called user
call waiting
waiting service
identifier
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PCT/CN2011/070234
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English (en)
French (fr)
Inventor
杨强
王忱
唐飞
Original Assignee
中兴通讯股份有限公司
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Publication of WO2011107001A1 publication Critical patent/WO2011107001A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16Communication-related supplementary services, e.g. call-transfer or call-hold
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/18Management of setup rejection or failure

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for processing a call.
  • the IP Multimedia Core Network Subsystem is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP).
  • 3GPP 3rd Generation Partnership Project
  • PSTN/ISDN Emulation Subsystem PES for short
  • PES Public Switched Telephone Network/Integrated Services Digital
  • Telecommunications and Internet converged Services IP-based Network architecture
  • TISPAN Protocols for Advanced Networking
  • ETSI European Telecommunication Standards Institute
  • H.248 users ETSI 183 0436 for ISDN users
  • 3GPP TS 24.615 for the IMS network call waiting service respectively Definition, and related implementation processes.
  • the call waiting service is used to allow new call incoming calls if the user is busy. Whether to select a call with a new incoming call or a call with a user who has entered the call state is determined by the call waiting service user using the relevant operation.
  • the principle of call waiting service implementation in ETSI 183 043 and ETSI 183 0436 is:
  • the application server Application Server, AS for short
  • the Internet Protocol that is, the VoIP gateway (VGW), the ISDN terminal or the Session Initiation Protocol (SIP) terminal, and the network elements determine whether there are idle terminals. For example, when the H.248 user carried by the AGCF is busy and allows it to use the hook-and-loop service, the call waiting process is implemented (for example, to the H.248 user).
  • the AGCF gives the Serving-Call Session Control Function (referred to as the Serving-Call Session Control Function).
  • a user-successful failure response (for example, a 486 message) is sent for the S-CSCF. If the user has a busy forwarding service, the S-CSCF/AS triggers the busy forwarding service after receiving the 486 message.
  • 1 is a call flow diagram of a call user of an AGCF band that is busy and does not support call waiting service according to the related art. As shown in FIG.
  • Step 4 S101 the user terminal and the user terminal B enter a call state.
  • Step S102 The user terminal C of the IMS network calls the user terminal A, and sends a session invitation to the AS/S-CSCF where the user terminal A is located through the network element such as the S-CSCF where the user terminal C is located.
  • Step S103 The AS/S-CSCF where the user terminal A is located sends a session invitation to the AGCF where the user terminal A is located.
  • Step S104 the AGCF puts a waiting tone to the user terminal A while confirming that the user is in a busy state and supports the hook-and-loop operation.
  • Step 4 gathers S 105 and gives the user terminal A a waiting tone while giving the user terminal A
  • the AS/S-CSCF returns a ringing response message (for example, 180 message) and carries a call waiting identifier in the ringing response message (for example, carrying Alert-Info: urn: service: call-waiting in 180 message) step S106.
  • the AS/S-CSCF can learn that the user cannot use the call waiting service according to the service information registered by the user, and then the S-CSCF where the user terminal C is located.
  • the network element sends a failure response message to the user terminal C to dismantle the session between the AS created by the user terminal C and the user terminal C.
  • Step S107 the AS/S-CSCF sends a failure response to the user terminal C, and gives the user
  • the AGCF in which the terminal A is located issues a release message to release the AC session between the AS and the AGCF created by the user terminal C. That is, the AS determines whether the call is triggered in the call according to the received ringing response message. The process and corresponding processing must require the AGCF to carry the information that the AGCF triggers the call waiting service in the 180 messages or other temporary response messages that are replied. Otherwise, the S-CSCF or AS cannot know the information.
  • the AS when the AS receives the ringing response message with the call waiting identifier, it needs to control the call flow in combination with whether the user has a call waiting service; and may trigger the wrong user service (for example, give the user a waiting tone). If the hook is snapped immediately after the user hears the wait tone, more and unexpected process control (eg, media switching, etc.) is generated.
  • the existing specifications and technologies not only the above defects and deficiencies exist for H.248 and other types of users of the AGCF band, but also for ISDN, Media Gateway Control Protocol (MGCP), P-CSCF/ Various users under the VGW will also have similar defects, and will not be mentioned here.
  • An ISDN number corresponds to multiple D channels and B channels or T1/E1), and the priority of the busy forwarding and call waiting services of the user cannot be effectively processed, so that the user may be allowed to use the call waiting service, or Bring undesired business services to users. If the AGCF/P-CSCF obtains the service information such as the call waiting of the user by means of subscription, etc., the AGCF/P-CSCF needs to record more service information as the access gateway control function entity, and, for the acquisition and update of the service.
  • a primary object of the present invention is to provide a call processing scheme to solve at least one of the above problems.
  • a method of processing a call is provided.
  • the method for processing a call comprises the steps of: receiving, by the network element, a call request carrying a call waiting service identifier sent from a serving call session control function entity S-CSCF or an application server AS, wherein the identifier is used to indicate a call Whether the requested called user supports the call waiting service; the network element determines whether to trigger the call waiting service of the called user according to the identity and the status information of the called user; and when it is determined that the call waiting service of the called user is not triggered Next, the call failure response is returned to the S-CSCF or AS; otherwise, the call waiting service of the called user is triggered.
  • determining whether to trigger the call waiting service of the called user according to the identifier and the status information of the called user includes: determining that the trigger is performed when the identifier is a call waiting service and the service status of the called user is busy. The called user's call is waiting for service.
  • determining whether to trigger the call waiting service of the called user according to the identifier and the status information of the called user includes: determining that the call waiting service of the called user is not triggered if the identifier is not supporting the call waiting service .
  • triggering the call waiting service of the called user includes: sending a waiting tone to the called user if the network element is the access gateway control function entity AGCF.
  • triggering the call waiting service of the called user further includes: sending a call request to the called user when the network element is the proxy call session control function entity P-CSCF, and the called user returns a ringing response to the P-CSCF .
  • the method further includes: returning a ringing response message to the sender of the call request, where the ringing response message carries the identifier.
  • the network element is at least one of the following: an AGCF, a P-CSCF, an IP network-based voice transmission gateway VGW, and a session initiation protocol SIP terminal.
  • an AGCF is provided.
  • the AGCF includes: a receiving module, configured to receive a call request that is sent from an S-CSCF or an AS and carries an identity of a call waiting service, wherein the identifier is used to indicate whether a called user of the call request supports call waiting a determining module, configured to determine, according to the identifier and the status information of the called user, whether to trigger the call waiting service of the called user; and the processing module, configured to: when the identifier is not supporting the call waiting service, to the S- The CSCF or AS back call failure response; in the case where the identity is that the call waiting service is supported and the called user's service status is busy, a waiting tone is sent to the called user.
  • a receiving module configured to receive a call request that is sent from an S-CSCF or an AS and carries an identity of a call waiting service, wherein the identifier is used to indicate whether a called user of the call request supports call waiting
  • a determining module configured to determine, according to the identifier and the status information of the
  • the determining module is further configured to: when the identifier is not supporting the call waiting service, determine not to trigger the call waiting service of the called user; the identifier is to support the call waiting service and the service status of the called user is busy. In the case, it is determined that the call waiting service of the called user is triggered.
  • a P-CSCF is provided.
  • the P-CSCF comprising: a receiving module, configured to receive a call request carrying a call waiting service identifier sent from a serving call session control function entity S-CSCF or an application server AS, wherein the identifier is used to indicate a call Whether the requested called user supports the call waiting service; the determining module is configured to determine whether to trigger the call waiting service of the called user according to the identifier and the status information of the called user; and the processing module is configured to determine not to trigger the called user In the case of a call waiting service, a call failure response is sent back to the S-CSCF or AS; otherwise, a call request is sent to the called user.
  • a receiving module configured to receive a call request carrying a call waiting service identifier sent from a serving call session control function entity S-CSCF or an application server AS, wherein the identifier is used to indicate a call Whether the requested called user supports the call waiting service
  • the determining module is configured to determine whether to trigger the call waiting service of the called user according to the identifie
  • the determining module is further configured to: when the identifier is not supporting the call waiting service, determine not to trigger the call waiting service of the called user; the identifier is to support the call waiting service and the service status of the called user is busy. In the case, it is determined that the call waiting service of the called user is triggered.
  • the method for carrying the call waiting service identifier in the call request is used to solve the problem that the AGCF/P-CSCF does not record whether the user activates the call waiting service in the related art, and causes the error handling of the call flow by the system. Improve network processing performance and efficiency.
  • FIG. 1 is a call flow diagram of a call user of an AGCF band according to the related art busy and does not support call waiting service;
  • FIG. 2 is a flowchart of a method for processing a call according to an embodiment of the present invention;
  • 3 is a structural block diagram of an AGCF according to an embodiment of the present invention;
  • FIG. 4 is a structural block diagram of a P-CSCF according to an embodiment of the present invention
  • 5 is a call flow diagram of a call user of an AGCF band that is busy and does not support call waiting service according to a preferred embodiment 1 of the present invention
  • FIG. 6 is a busy user of the AGCF band in the preferred embodiment 2 of the present invention
  • FIG. 7 is a flow chart of a VGW or SIP terminal call waiting of a P-CSCF band according to a preferred embodiment 3 of the present invention.
  • FIG. 2 is a flowchart of a method for processing a call according to an embodiment of the present invention.
  • the method includes the following steps: Step S202, a network element Receiving a call request carrying a call waiting service identifier sent from the S-CSCF or the AS, where the identifier is used to indicate whether the called user of the call request supports the call waiting service.
  • Step S204 The network element determines, according to the identifier and the status information of the called user, whether to trigger the call waiting service of the called user.
  • the status information of the called user refers to the service status of the user, that is, "idle” or "busy”.
  • Step S206 In the case that it is determined that the call waiting service of the called user is not triggered, the call failure response is returned to the S-CSCF or the AS; otherwise, the call waiting service of the called user is triggered.
  • the call waiting service of the terminal for example, H.248 and ISDN terminal
  • the call waiting service of the terminal is implemented on the AGCF/P-CSCF by using the call waiting service identifier in the call request, and the related technology is solved.
  • the AGCF/P-CSCF does not record whether the user has opened the call waiting service information, which causes the system to handle the error of the call flow, so that the system can better be compatible with the busy call service and enhance the adaptability to the call flow service. , improve network processing performance and efficiency.
  • a call may be initiated by the S-CSCF or AS to the AGCF/P-CSCF and carry a call waiting service indication when the call is made.
  • the identifier is to support the call waiting service and the service status of the called user is busy, determining to trigger the call waiting service of the called user. Thereby improving the practicability of the system.
  • triggering the call waiting service of the called user may include: sending a waiting tone to the called user if the network element is the AGCF; and in the case that the network element is the P-CSCF, The called user sends a call request, and the called user returns a ringing response to the P-CSCF.
  • the ringing response message is sent back to the sender of the call request, where the ringing response message carries the identifier, so that the network element identifies which users in the group and the registration, the call is enhanced.
  • the performance of process control may be at least one of the following: AGCF, P-CSCF, VGW,
  • FIG. 3 is a structural block diagram of an AGCF according to an embodiment of the present invention.
  • the AGCF includes: a receiving module 302, a determining module 304, and Processing module 306, which will be described in detail below.
  • the receiving module 302 is configured to receive a call request that is sent by the S-CSCF or the AS and that carries the call waiting service identifier, where the identifier is used to indicate whether the called user of the call request supports the call waiting service; the determining module 304 is coupled to The receiving module 302 is configured to determine, according to the identifier and the status information of the called user, whether to trigger the call waiting service of the called user, and the processing module 306, coupled to the determining module 304, configured to not support the call waiting service in the identifier. In the case, the call failure response is returned to the S-CSCF or the AS; when the identity is that the call waiting service is supported and the service status of the called user is busy, the waiting tone is sent to the called user.
  • the determining module 304 is further configured to: when the identifier is not supporting the call waiting service, determine not to trigger the call waiting service of the called user; and the identifier is a call waiting service and the called user's monthly service status In the case of busy, it is determined that the call waiting service of the called user is triggered.
  • this embodiment uses the method of carrying the call waiting service identifier in the call request, and the defect that the ISDN or other types of users cannot be judged by the S-CSCF or the AS to be busy is enhanced, and the call is enhanced.
  • the adaptability of the process business improves network processing performance and efficiency.
  • a P-CSCF is also provided in this embodiment. FIG.
  • the P-CSCF includes: a receiving module. 402, determining module 404 and processing module 406, the structure will be described in detail below.
  • the receiving module 402 is configured to receive a call request that is sent by the S-CSCF or the AS and that carries the call waiting service identifier, where the identifier is used to indicate whether the called user of the call request supports the call waiting service; the determining module 404 is coupled to The receiving module 402 is configured to determine, according to the identifier and the status information of the called user, whether to trigger the call waiting service of the called user, and the processing module 406 is coupled to the determining module 404, configured to determine not to trigger the call waiting of the called user.
  • the determining module 404 is further configured to: if the identity is not supporting the call waiting service, determine not to trigger the call waiting service of the called user; the identity is to support the call waiting service and the service status of the called user is busy In the case, it is determined that the call waiting service of the called user is triggered.
  • the embodiment uses the call waiting service identifier in the call request, and stores the service information in the S-CSCF/AS, so that the service information such as the call waiting of the user is not recorded in the AGCF/P-CSCF.
  • FIG. 5 is a call flow diagram of the system in which the called user of the AGCF band according to the preferred embodiment 1 of the present invention is busy and does not support the call waiting service, as shown in FIG. 5 .
  • Step S501 The user terminal and the user terminal B enter a call state.
  • step S502 the user terminal C of the IMS network calls the user A, and sends a session invitation to the AS/S-CSCF where the user terminal A is located through the network element such as the S-CSCF where the user terminal C is located.
  • step S503 The AS/S-CSCF where the user terminal A is located sends a session invitation to the AGCF where the user terminal A is located.
  • the user terminal A does not have a call waiting service (or the user terminal A registers and activates the busy forwarding service, and the priority of the busy forwarding service is higher than the priority of the call waiting service.
  • step S504 the AGCF determines that the user is in a busy state. However, since the received session invitation message indicates that the user terminal A cannot use the call waiting service, the AGCF returns the A/S-CSCF to which the A user is located. The resulting failure response message (for example, 486 message in the SIP protocol). In the specific implementation process, the subsequent process can be implemented according to the prior art.
  • step S505 after receiving the failure response message caused by the A user busy, the AS/S-CSCF where the user A is located, if the user does not register or activate the busy forwarding service, the S through the user terminal C
  • the network element such as the CSCF sends a failure response message to the user terminal C. If the A user registers and activates the busy forwarding service, the busy forwarding process is triggered.
  • Preferred Embodiment 2 the user of the call support service under the AGCF is already in a session, and there is a new call incoming call, and the call flow of the system when the call is called in the new call.
  • Step S601 The user terminal and the user terminal B enter a call. I state.
  • Step S602 The user terminal C of the IMS network calls the user terminal A, and sends a session invitation to the AS/S-CSCF where the A user is located through the network element such as the S-CSCF where the user terminal C is located.
  • Step S603 The AS/S-CSCF where the user terminal A is located sends a session invitation to the AGCF where the user terminal A is located.
  • the session invitation message is sent to the AGCF.
  • the call waiting service identifier is carried in to notify the AGCF, and the user terminal A can use the call waiting service.
  • the AGCF determines that the user is in a busy state, but because the received session invitation message has identified that the user terminal A can use the call waiting service, the user is placed with a waiting tone.
  • Step S605 returning a ringing response message (for example, 180 message) to the AS/S-CSCF where the A user is located while giving the user a waiting tone, and carrying the call waiting identifier in the ringing response message (eg, The 180 message carries Alert-Info: urn: service: call-waiting ).
  • Step S606 the AS/S-CSCF forwards the received ringing response message to the user C through the S-CSCF where the user C is located. While forwarding the ringing response message, the AS/S-CSCF can send a hold tone to the user C according to the call waiting identifier in the message. Subsequent processes related to call waiting services, existing specifications and technologies, are not described in it.
  • FIG. 7 is the VGW or SIP terminal of the P-CSCF band according to the preferred embodiment 3 of the present invention.
  • the flow chart of call waiting includes the following steps: Step S701: The user terminal and the user terminal B enter a call state.
  • step S702 the user terminal C of the IMS network calls the terminal user A, and sends a session invitation to the AS/S-CSCF where the A user is located through the network element such as the S-CSCF where the user terminal C is located.
  • Step S703 the AS/S-CSCF where the user terminal A is located sends a session invitation to the P-CSCF where the user terminal A is located.
  • the session is sent to the P-CSCF.
  • the invitation message carries a call waiting service identifier to notify the P-CSCF that the user terminal A can use the call waiting service.
  • Step S704 the P-CSCF determines that the user is in a busy state, but because the received session invitation message has already identified that the user terminal A can use the call waiting service, and sends a session invitation to the SIP terminal corresponding to the VGW or the A user where the A user is located.
  • Step S705 The SIP terminal corresponding to the VGW or the A user where the A user is located sends a ringing ring response message to the P-CSCF where the A user is located (for example, 180 messages of the SIP protocol).
  • Step S706 the P-CSCF forwards a ringing response message (for example, 180 message) to the AS/S-CSCF where the A user is located, and carries a call waiting identifier in the ringing response message (for example, in the 180 message) Carry Alert-Info: urn: service: call-waiting ). If the P-CSCF cannot judge whether the user it is carrying is in a busy state, after receiving the session invitation message from the network element such as the S-CSCF, the session invitation may be sent to the VGW or the SIP terminal. Step S707, the AS/S-CSCF forwards the received ringing response message to the user terminal C through the S-CSCF where the user terminal C is located.
  • a ringing response message for example, 180 message
  • Carry Alert-Info: urn service: call-waiting
  • the AS/S-CSCF can forward the ringing response message to the user terminal C according to the call waiting identifier in the message. Subsequent processes related to call waiting services, which have specifications and technologies, are not described here. It should be noted that the AGCF, the P-CSCF, the S-CSCF, the AS, and the User Equipment (UE) network element and the messages between them are used to clearly indicate that the IMS network supports the AGCF user. The idea of call waiting service implementation is not limited to these network elements and messages in a specific implementation. If the priority of the call waiting and busy forwarding needs to be considered, the priority of the busy forwarding is higher than the priority of the call waiting service, and if the user has a busy forwarding service, the AGCF is sent to the AGCF.
  • the priority of the call waiting and busy forwarding needs to be considered, the priority of the busy forwarding is higher than the priority of the call waiting service, and if the user has a busy forwarding service, the AGCF is sent to the AGCF.
  • the INVITE message of the /P-CSCF does not carry the call waiting service identifier, so that the AGCF/P-CSCF considers that the user does not have a call waiting for service.
  • the specific logical judgment is implemented by the network elements such as AS and S-CSCF according to actual needs.
  • the embodiment of the present invention uses the method of storing service information in the S-CSCF/AS, and solves the problem that the AGCF/P-CSCF does not record whether the user activates the call waiting service in the related art, and the system calls the call flow.

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Abstract

本发明公开了一种呼叫的处理方法和装置,该方法包括以下步骤:网元接收从服务呼叫会话控制功能实体S-CSCF或应用服务器AS发送的携带有呼叫等待业务标识的呼叫请求,其中,该标识用于指示呼叫请求的被叫用户是否支持呼叫等待业务;网元根据该标识和被叫用户的状态信息确定是否触发被叫用户的呼叫等待业务;以及在确定不触发被叫用户的呼叫等待业务的情况下,向S-CSCF或AS回呼叫失败响应;否则,触发被叫用户的呼叫等待业务。通过本发明提高了网络处理性能和效率。

Description

呼叫的处理方法和装置 技术领域 本发明涉及通信领域, 尤其涉及一种呼叫的处理方法和装置。 背景技术 IP多媒体子系统 ( IP Multimedia Core Network Subsystem, 简称为 IMS ) 是由第三代合作伙伴计划 ( 3rd Generation Partnership Project, 简称为 3GPP ) 组织提出的一种基于 IP的网络架构, 构建了一个开放而灵活的业务环境, 支 持多媒体应用, 并为用户提供丰富的多媒体业务。 公用电话交换网 /综合业务数字网仿真子系统( Public Switched Telephone Network /Integrated Services Digital, 即, PSTN/ISDN Emulation Subsystem, 简称为 PES )是电信和互联网融合业务及高级网络协议 ( Telecommunications and Internet converged Services and Protocols for Advanced Networking,简称为 TISPAN)对传统终端接入 IMS网络提出的一种基于 IP的网络架构。 欧洲电信标准化组织 ( European Telecommunication Standards Institute , 简称为 ETSI ) 183 043对于传统用户 (例 ^口, H.248用户)、 ETSI 183 0436 对于 ISDN用户、 3GPP TS 24.615对于 IMS网络的呼叫等待业务分别故了定 义, 并有相关的实现流程。 该呼叫等待业务的用于在用户忙的情况下, 允许 新的呼叫呼入。 至于选择与新呼入的用户通话还是与已经进入通话态的用户 通话, 是由呼叫等待业务用户使用相关操作来选择决定的。 ETSI 183 043、 ETSI 183 0436中呼叫等待业务实现的原理为: 应 U艮务 器 ( Application Server, 简称为 AS ) 可以不判断 (或者, 有些 AS没有能力 判断) 用户是否处于忙状态, 而将呼叫发往接入网关控制功能实体 (Access Gateway Control Function, 简称为 AGCF )、 代理呼叫会话控制功能实体 ( Proxy-Call Session Control Function, 简称为 P-CSCF ),基于 IP网络的语音 传输网关( Voice over Internet Protocol, 即 VoIP网关, 简称为 VGW ), ISDN 终端或会话初始化协议( Session Initiation Protocol, 简称为 SIP )终端, 并由 这些网元来判断是否有空闲终端。 例如, AGCF所带的 H.248用户处于忙状 态且允许其使用叉簧类业务时, 则实现呼叫等待流程 (例如, 给 H.248用户 放等待音,用户可以拍叉簧进行呼叫转换等); 在用户处于忙状态且不允许其 使用叉簧类业务时, 则由 AGCF给服务呼叫会话控制功能实体( Serving-Call Session Control Function, 简称为 S-CSCF )发送用户忙的失败响应 (例如, 486消息)。 如果用户有遇忙前转业务, S-CSCF/AS在接收到 486消息后, 则 触发遇忙前转业务。 图 1是根据相关技术的 AGCF带的被叫用户忙且不支持呼叫等待业务的 呼叫流程图,如图 1所示,该流程主要包括以下处理(步骤 S 101-步骤 S 107 ): 步 4聚 S 101 , 用户终端 、 用户终端 B进入通话^ I 态。 步骤 S 102, IMS网络的用户终端 C呼叫用户终端 A, 通过用户终端 C 所在的 S-CSCF等网元向用户终端 A所在的 AS/S-CSCF发会话邀请。 步骤 S 103 , 用户终端 A所在的 AS/S-CSCF向用户终端 A所在的 AGCF 发会话邀请。 步骤 S 104 , AGCF在确认用户处于忙状态且支持叉簧操作的情况下, 给 用户终端 A放等待音。 步 4聚 S 105 , 在给用户终端 A放等待音的同时, 给用户终端 A所在的
AS/S-CSCF回振铃响应消息(例如, 180消息), 并在振铃响应消息中携带呼 叫等待标识 (例如, 在 180消息中携带 Alert-Info: urn: service: call-waiting )„ 步骤 S 106, AS/S-CSCF收到携带有呼叫等待标识的振铃响应消息后, 可 以根据用户登记的业务信息, 得知用户不能使用呼叫等待业务, 于是通过用 户终端 C所在的 S-CSCF等网元给用户终端 C发失败响应消息, 以拆除用户 终端 C创建的 AS与用户终端 C之间的会话。 步骤 S 107, AS/S-CSCF在给用户终端 C发失败响应的同时, 给用户终 端 A所在的 AGCF发释放消息, 以释放由用户终端 C创建的 AS与 AGCF 之间的 A-C会话。 也就是说, 要实现 AS根据收到的振铃响应消息来判断呼叫中是否触发 了呼叫等待流程并做相应的处理, 就一定要求 AGCF在回复的 180消息或其 它临时响应消息中必须携带 AGCF触发呼叫等待业务的信息。 否则, S-CSCF 或 AS无法得知用户是否处于忙状态, 就会让本没有呼叫等待业务的 AGCF 用户使用呼叫等待业务 (即, 没有能够按照用户的期望进行处理, 而是强迫 用户使用呼叫等待业务, 进而无法实现用户的遇忙前转或释放呼叫的要求;)。 而且,即使在 AGCF回的 180消息或其它临时响应消息中已经携带 AGCF 触发呼叫等待业务的信息的情况下, 也还是要求 S-CSCF或 AS在收到该消 息后, 做特殊的处理。 例如, 要发起释放或遇忙前转流程, 这与一般的对 18x 临时响应消息的处理并不相符。 图 1只是以 AGCF下带 H.248协议用户为例, 简要说明了相关技术因 AGCF错误触发了呼叫等待流程,而给 AGCF和 AS的后续处理带来的不便。 例如, AS在收到带有呼叫等待标识的振铃响应消息时, 需要结合用户是否 有呼叫等待业务故不同的呼叫流程控制; 以及可能触发错误的用户业务 (例 如, 给用户放等待音)。 如果在用户听到等待音后立即拍了叉簧, 则会产生更 多的、 不可预期的流程控制 (例如, 媒体切换等)。 在现有规范和技术中, 不 仅对于 AGCF带的 H.248和其它类型的用户存在以上缺陷和不足, 而且对于 ISDN,媒体网关控制协议 ( Media Gateway Control Protocol, 简称为 MGCP ), P-CSCF/VGW下的各种用户也同样会有类似的缺陷, 在此不再赞述。 因此, 由于相关技术在 AGCF/P-CSCF不记录用户是否有呼叫等待业务, 且 AS或 I/S-CSCF不能对用户的忙闲状态进行有效判断的情况下(例如, 通 过 AGCF接入 IMS网络的一个 ISDN号码对应多个 D通道和 B通道或 T1/E1 ), 无法实现对用户的遇忙前转和呼叫等待业务的优先级进行有效处 理, 以至于可能让用户越权使用呼叫等待业务, 或者带给用户不希望的业务 服务。 如果釆用订阅等方式让 AGCF/P-CSCF获取用户的呼叫等待等业务信 息, 那么 AGCF/P-CSCF作为接入网关控制功能实体需要记录更多的业务信 息, 并且, 为了业务的获取与更新, 还需要 AGCF/P-CSCF额外的支持一些 功能或消息交互。 发明内容 本发明的主要目的在于提供一种呼叫的处理方案, 以至少解决上述问题 之一。 为了实现上述目的, 才艮据本发明的一个方面, 提供了一种呼叫的处理方 法。 根据本发明的呼叫的处理方法包括以下步骤: 网元接收到从服务呼叫会 话控制功能实体 S-CSCF或应用服务器 AS发送的携带有呼叫等待业务标识 的呼叫请求, 其中, 该标识用于指示呼叫请求的被叫用户是否支持呼叫等待 业务; 网元才艮据该标识和被叫用户的状态信息确定是否触发被叫用户的呼叫 等待业务; 以及在确定不触发被叫用户的呼叫等待业务的情况下, 向 S-CSCF 或 AS回呼叫失败响应; 否则, 触发被叫用户的呼叫等待业务。 优选地, 才艮据该标识和被叫用户的状态信息确定是否触发被叫用户的呼 叫等待业务包括: 在该标识为支持呼叫等待业务且被叫用户的服务状态为忙 的情况下, 确定触发被叫用户的呼叫等待业务。 优选地, 才艮据该标识和被叫用户的状态信息确定是否触发被叫用户的呼 叫等待业务包括: 在该标识为不支持呼叫等待业务的情况下, 确定不触发被 叫用户的呼叫等待业务。 优选地, 触发被叫用户的呼叫等待业务包括: 在网元为接入网关控制功 能实体 AGCF的情况下, 向被叫用户发送等待音。 优选地, 触发被叫用户的呼叫等待业务还包括: 在网元为代理呼叫会话 控制功能实体 P-CSCF的情况下, 向被叫用户发送呼叫请求, 被叫用户返回 振铃响应给 P-CSCF。 优选地, 触发被叫用户的呼叫等待业务之后, 上述方法还包括: 向呼叫 请求的发送方回振铃响应消息, 其中, 振铃响应消息中携带有该标识。 优选地, 网元为以下至少之一: AGCF、 P-CSCF, 基于 IP网络的语音传 输网关 VGW、 会话初始化协议 SIP终端。 为了实现上述目的, 才艮据本发明的另一方面, 提供了一种 AGCF。 根据本发明的 AGCF, 包括: 接收模块, 设置为接收从 S-CSCF或 AS 发送的携带有呼叫等待业务的标识的呼叫请求, 其中, 该标识用于指示呼叫 请求的被叫用户是否支持呼叫等待业务; 确定模块, 设置为根据该标识和被 叫用户的状态信息确定是否触发被叫用户的呼叫等待业务; 以及处理模块, 设置为在该标识为不支持呼叫等待业务的情况下, 向 S-CSCF或 AS回呼叫 失败响应; 在该标识为支持呼叫等待业务和被叫用户的服务状态为忙的情况 下, 向被叫用户发送等待音。 优选地, 确定模块还设置为在该标识为不支持呼叫等待业务的情况下, 确定不触发被叫用户的呼叫等待业务; 在该标识为支持呼叫等待业务且被叫 用户的服务状态为忙的情况下, 确定触发被叫用户的呼叫等待业务。 为了实现上述目的, 根据本发明的另一方面, 提供了一种 P-CSCF。 根据本发明的 P-CSCF, 包括: 接收模块, 设置为接收从服务呼叫会话 控制功能实体 S-CSCF或应用服务器 AS发送的携带有呼叫等待业务标识的 呼叫请求, 其中, 该标识用于指示呼叫请求的被叫用户是否支持呼叫等待业 务; 确定模块, 设置为根据该标识和被叫用户的状态信息确定是否触发被叫 用户的呼叫等待业务; 以及处理模块, 设置为在确定不触发被叫用户的呼叫 等待业务的情况下, 向 S-CSCF或 AS回呼叫失败响应; 否则, 向被叫用户 发送呼叫请求。 优选地, 确定模块还设置为在该标识为不支持呼叫等待业务的情况下, 确定不触发被叫用户的呼叫等待业务; 在该标识为支持呼叫等待业务且被叫 用户的服务状态为忙的情况下, 确定触发被叫用户的呼叫等待业务。 通过本发明, 釆用在呼叫请求中携带呼叫等待业务标识的方式, 解决了 相关技术中 AGCF/P-CSCF没有记录用户是否开通呼叫等待业务的信息而导 致系统对呼叫流程的错误处理的问题, 提高了网络处理性能和效率。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1是根据相关技术的 AGCF带的被叫用户忙且不支持呼叫等待业务的 呼叫流程图; 图 2是才艮据本发明实施例的呼叫的处理方法的流程图; 图 3是才艮据本发明实施例的 AGCF的结构框图; 图 4是才艮据本发明实施例的 P-CSCF的结构框图; 图 5是才艮据本发明优选实施例一的 AGCF带的被叫用户忙且不支持呼叫 等待业务的呼叫流程图; 图 6是 居本发明优选实施例二的 AGCF带的被叫用户忙且支持呼叫等 待业务的呼叫流程图; 图 7是才艮据本发明优选实施例三的 P-CSCF带的 VGW或 SIP终端呼叫 等待的流程图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在 不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互组合。 在本实施例中, 提供了一种呼叫的处理方法, 图 2是根据本发明实施例 的呼叫的处理方法的流程图, 如图 2所示, 该方法包括以下步^^ 步骤 S202, 网元接收从 S-CSCF或 AS发送的携带有呼叫等待业务标识 的呼叫请求, 其中, 该标识用于指示呼叫请求的被叫用户是否支持呼叫等待 业务。 步骤 S204,上述网元根据该标识和被叫用户的状态信息确定是否触发被 叫用户的呼叫等待业务。其中,被叫用户的状态信息是指该用户的服务状态, 即, "空闲 "或"忙"等。 步骤 S206, 在确定不触发被叫用户的呼叫等待业务的情况下, 向所述 S-CSCF或所述 AS回呼叫失败响应; 否则, 触发被叫用户的呼叫等待业务。 通过上述步骤 S202至步骤 S206, 釆用在呼叫请求中携带呼叫等待业务 标识的方式, 在 AGCF/P-CSCF上实现终端(例如, H.248和 ISDN终端)的 呼叫等待业务, 解决了相关技术中 AGCF/P-CSCF没有记录用户是否开通呼 叫等待业务的信息而导致系统对呼叫流程的错误处理的问题, 使得系统能够 更好地与遇忙呼叫业务兼容, 增强了对呼叫流程业务的适应能力, 提高了网 络处理性能和效率。 在步骤 S202之前, 可以由 S-CSCF或 AS向 AGCF/P-CSCF发起呼叫, 并在呼叫时携带呼叫等待业务指示。 优选地, 在步骤 S204中, 在该标识为支持呼叫等待业务且被叫用户的 服务状态为忙的情况下, 确定触发被叫用户的呼叫等待业务。 从而提高了系 统的实用性。 另外, 在该标识为不支持呼叫等待业务的情况下, 确定不触发被叫用户 的呼叫等待业务。 例如, 对于无呼叫等待业务支持的 INVITE消息, 如果用 户忙, 则给 CSCF回用户忙失败响应消息 (例如, 486消息)。 该方法提高了 呼叫流程的控制功能以及系统的处理能力, 增加了用户体验。 优选地, 在步骤 S206中, 触发被叫用户的呼叫等待业务可以包括: 在 上述网元为 AGCF的情况下,向被叫用户发送等待音;在上述网元为 P-CSCF 的情况下, 向被叫用户发送呼叫请求, 被叫用户返回振铃响应给 P-CSCF。 所以, 该方法可以提高系统的适应能力, 增强了系统的灵活性。 优选地, 在步骤 S206之后, 向呼叫请求的发送方回振铃响应消息, 其 中, 振铃响应消息中携带有该标识, 以便于网元识别哪些组中的哪些用户以 及通过注册, 提高了呼叫流程控制的性能。 需要说明的是, 上述网元可以为以下至少之一: AGCF, P-CSCF, VGW、
SIP终端。 即, 本发明实施例不仅仅适用于 AGCF/P-CSCF, 也同样适用于 VGW、 或普通的 SIP终端。 对应于上述的方法, 在本实施例中还提供了一种 AGCF, 图 3是根据本 发明实施例的 AGCF的结构框图, 如图 3所示, 该 AGCF包括: 接收模块 302、 确定模块 304和处理模块 306 , 下面对该结构进行详细说明。 接收模块 302 ,设置为接收从 S-CSCF或 AS发送的携带有呼叫等待业务 标识的呼叫请求, 其中, 该标识用于指示呼叫请求的被叫用户是否支持呼叫 等待业务; 确定模块 304 , 耦合至接收模块 302 , 设置为根据该标识和被叫 用户的状态信息确定是否触发被叫用户的呼叫等待业务; 以及处理模块 306 , 耦合至确定模块 304 , 设置为在该标识为不支持呼叫等待业务的情况下, 向 S-CSCF或 AS回呼叫失败响应;在该标识为支持呼叫等待业务和被叫用户的 服务状态为忙的情况下, 向被叫用户发送等待音。 优选地, 确定模块 304还设置为在该标识为不支持呼叫等待业务的情况 下, 确定不触发被叫用户的呼叫等待业务; 在该标识为支持呼叫等待业务且 被叫用户的月艮务状态为忙的情况下, 确定触发被叫用户的呼叫等待业务。 通过上述 AGCF, 该实施例釆用在呼叫请求中携带呼叫等待业务标识的 方式,克月艮了 ISDN或其他类型用户无法由 S-CSCF或 AS来判断是否处于忙 状态的缺陷, 增强了对呼叫流程业务的适应能力, 提高了网络处理性能和效 率。 对应于上述的方法, 在本实施例中还提供了一种 P-CSCF, 图 4是根据 本发明实施例的 P-CSCF的结构框图, 如图 4所示, 该 P-CSCF包括: 接收 模块 402、 确定模块 404和处理模块 406 , 下面对该结构进行详细说明。 接收模块 402 ,设置为接收从 S-CSCF或 AS发送的携带有呼叫等待业务 标识的呼叫请求, 其中, 该标识用于指示呼叫请求的被叫用户是否支持呼叫 等待业务; 确定模块 404 , 耦合至接收模块 402 , 设置为根据该标识和被叫 用户的状态信息确定是否触发被叫用户的呼叫等待业务; 以及处理模块 406 , 耦合至确定模块 404 , 设置为在确定不触发被叫用户的呼叫等待业务的情况 下, 向 S-CSCF或 AS回呼叫失败响应; 否则, 向被叫用户发送呼叫请求。 优选地, 确定模块 404还设置为在该标识为不支持呼叫等待业务的情况 下, 确定不触发被叫用户的呼叫等待业务; 在该标识为支持呼叫等待业务且 被叫用户的服务状态为忙的情况下, 确定触发被叫用户的呼叫等待业务。 通过上述 P-CSCF , 该实施例釆用在呼叫请求中携带呼叫等待业务标识 的方式, 将业务信息存储在 S-CSCF/AS , 使得在 AGCF/P-CSCF不记录用户 呼叫等待等业务信息的前提下, 呼叫等待业务可以更好地与遇忙呼叫业务兼 容, 提高了网络处理性能和效率。 以下结合附图对本发明的优选实施例进行说明, 应当理解, 此处所描述 的优选实施例仅用于说明和解释本发明, 并不用于限定本发明。 优选实施例一 在本优选实施例中, 主要描述了 AGCF下的不支持呼叫等待业务的用户 (即, AGCF带的不支持呼叫等待业务的用户) 已经处于一个会话中, 又有 新呼叫呼入, 在新呼叫中作为被叫时的系统的呼叫流程, 图 5是才艮据本发明 优选实施例一的 AGCF带的被叫用户忙且不支持呼叫等待业务的呼叫流程 图, 如图 5所示, 包括以下步 4聚: 步骤 S501 , 用户终端 、 用户终端 B进入通话^ I 态。 步骤 S502, IMS网络的用户终端 C呼叫用户 A, 通过用户终端 C所在 的 S-CSCF等网元向用户终端 A所在的 AS/S-CSCF发会话邀请。 步骤 S503 , 用户终端 A所在的 AS/S-CSCF向用户终端 A所在的 AGCF 发会话邀请。 在发送给 AGCF的会话邀请消息中, 以用户终端 A没有呼叫等 待业务(或者用户终端 A登记并激活了遇忙前转业务, 且遇忙前转业务的优 先级比呼叫等待业务的优先级高的情况下) 为依据, 携带没有呼叫等待业务 的标识, 以通知 AGCF , 用户终端 A不可以使用呼叫等待业务。 步骤 S504, AGCF在判断用户处于忙状态, 但是, 由于收到的会话邀请 消息中已经标识用户终端 A不可以使用呼叫等待业务, 所以 AGCF给 A用 户所在的 AS/S-CSCF回因 A用户忙引起的失败响应消息(例如, SIP协议中 的 486消息)。 在具体实施过程中,后续流程可以按照现有技术实现。例如, 步骤 S505 , A用户所在的 AS/S-CSCF在收到 AGCF的因 A用户忙引起的失败响应消息 后, 如果用户没有登记或激活遇忙前转业务, 则通过用户终端 C所在的 S-CSCF等网元给用户终端 C发失败响应消息; 如果 A用户登记并激活遇忙 前转业务, 则触发遇忙前转流程。 优选实施例二 在本优选实施例中, 主要描述了 AGCF下的支持呼叫等待业务的用户已 经处于一个会话中, 又有新呼叫呼入, 在新呼叫中作为被叫时的系统的呼叫 流程, 图 6是 居本发明优选实施例二的 AGCF带的被叫用户忙且支持呼叫 等待业务的呼叫流程图, 如图 6所示, 包括以下步骤: 步骤 S601 , 用户终端 、 用户终端 B进入通话^ I 态。 步骤 S602, IMS网络的用户终端 C呼叫用户终端 A, 通过用户终端 C 所在的 S-CSCF等网元向 A用户所在的 AS/S-CSCF发会话邀请。 步骤 S603 , 用户终端 A所在的 AS/S-CSCF向用户终端 A所在的 AGCF 发会话邀请。 以用户终端 A有呼叫等待业务(且用户终端 A没有激活遇忙前 转业务, 或者呼叫等待业务的优先级比遇忙前转业务的优先级高) 为例, 在 发给 AGCF的会话邀请消息中携带有呼叫等待业务标识, 以通知 AGCF, 用 户终端 A可以使用呼叫等待业务。 步骤 S604, AGCF在判断用户处于忙状态, 但是, 由于收到的会话邀请 消息中已经标识用户终端 A可以使用呼叫等待业务, 给用户放等待音。 步骤 S605 , 在给用户放等待音的同时, 给 A用户所在的 AS/S-CSCF回 振铃响应消息 (例如, 180消息), 并在振铃响应消息携带呼叫等待标识(例 ^口, 在 180消息中携带 Alert- Info: urn: service: call-waiting )。 步骤 S606, AS/S-CSCF将收到的振铃响应消息通过用户 C所在的 S-CSCF转发给用户 C。 AS/S-CSCF在转发振铃响应消息的同时, 可以才艮据 消息中的呼叫等待标识给用户 C放保持音。 后续有关呼叫等待业务的流程, 已有规范和技术, 在 it匕不描述。 优选实施例三 在本优选实施例中, 主要描述了 P-CSCF带的 VGW、 SIP终端的呼叫等 待流程, 图 7是才艮据本发明优选实施例三的 P-CSCF带的 VGW或 SIP终端 呼叫等待的流程图, 如图 7所示, 包括以下步骤: 步骤 S701 , 用户终端 、 用户终端 B, 进入通话状态。 步骤 S702, IMS网络的用户终端 C呼叫用终端户 A, 通过用户终端 C 所在的 S-CSCF等网元向 A用户所在的 AS/S-CSCF发会话邀请。 步骤 S703 ,用户终端 A所在的 AS/S-CSCF向用户终端 A所在的 P-CSCF 发会话邀请。 以用户终端 A有呼叫等待业务(且用户终端 A没有激活遇忙前 转业务, 或者呼叫等待业务的优先级比遇忙前转业务的优先级高) 为例, 在 发给 P-CSCF的会话邀请消息中携带有呼叫等待业务标识, 以通知 P-CSCF, 用户终端 A可以使用呼叫等待业务。 步骤 S704, P-CSCF在判断用户处于忙状态、 但由于收到的会话邀请消 息中已经标识用户终端 A可以使用呼叫等待业务,给 A用户所在的 VGW或 A用户所对应的 SIP终端发会话邀请。 步骤 S705 , A用户所在的 VGW或 A用户所对应的 SIP终端给 A用户 所在的 P-CSCF发振铃响应消息 (例如, SIP协议的 180消息)。 步骤 S706, P-CSCF给 A用户所在的 AS/S-CSCF转发振铃响应消息(例 如, 180消息), 并在振铃响应消息携带呼叫等待标识(例如, 在 180消息中 携带 Alert-Info: urn: service: call-waiting )。 如果 P-CSCF不能判断其所带的 用户是否处于忙状态, 在收到来自于 S-CSCF等网元的会话邀请消息后, 则 给 VGW或 SIP终端发会话邀请即可。 步骤 S707, AS/S-CSCF将收到的振铃响应消息通过用户终端 C所在的 S-CSCF转发给用户终端 C。 AS/S-CSCF在转发振铃响应消息的同时, 可以 才艮据消息中的呼叫等待标识, 给用户终端 C放保持音。 后续有关呼叫等待业 务的流程, 已有规范和技术, 在此不描述。 需要说明的是, 实施例中的 AGCF、 P-CSCF, S-CSCF, AS、 用户终端 ( User Equipment, 简称为 UE ) 网元及它们之间的消息, 是为了清楚的表示 IMS网络支持 AGCF用户呼叫等待业务实现的思想, 在具体的实现中, 不局 限于这些网元和消息。 如果需要考虑用户的呼叫等待与遇忙前转的优先级, 则在遇忙前转的优先级比呼叫等待业务的优先级高, 且用户有遇忙前转业务 的情况下, 在发给 AGCF/P-CSCF的 INVITE消息中, 不要携带呼叫等待业 务标识, 让 AGCF/P-CSCF认为用户没有呼叫等待业务即可。 具体的逻辑判 断由 AS、 S-CSCF等网元才艮据实际需要实现。 综上所述, 本发明实施例釆用将业务信息存储在 S-CSCF/AS的方式, 解 决了相关技术中 AGCF/P-CSCF没有记录用户是否开通呼叫等待业务的信息 而导致系统对呼叫流程的错误处理的问题, 克服了相关技术中 ISDN或其他 类型用户无法由 S-CSCF或 AS来判断是否处于忙状态的缺陷, 增强了对呼 叫流程业务的适应能力, 提高了网络处理性能和效率。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并 且在某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者 将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的^"神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种呼叫的处理方法, 包括以下步 4聚:
网元接收从服务呼叫会话控制功能实体 S-CSCF或应用服务器 AS 发送的携带有呼叫等待业务标识的呼叫请求, 其中, 所述标识用于指 示所述呼叫请求的被叫用户是否支持呼叫等待业务;
所述网元 -据所述标识和所述被叫用户的状态信息确定是否触发 所述被叫用户的所述呼叫等待业务; 以及
在确定不触发所述被叫用户的所述呼叫等待业务的情况下, 向所 述 S-CSCF或所述 AS回呼叫失败响应; 否则, 触发所述被叫用户的所 述呼叫等待业务。
2. 根据权利要求 1所述的方法, 其中, 根据所述标识和所述被叫用户的 状态信息确定是否触发所述被叫用户的呼叫等待业务包括: 在所述标 识为支持呼叫等待业务且所述被叫用户的服务状态为忙的情况下, 确 定触发所述被叫用户的所述呼叫等待业务。
3. 根据权利要求 1所述的方法, 其中, 根据所述标识和所述被叫用户的 状态信息确定是否触发所述被叫用户的呼叫等待业务包括: 在所述标 识为不支持呼叫等待业务的情况下, 确定不触发所述被叫用户的所述 呼叫等待业务。
4. 根据权利要求 1或 2所述的方法, 其中, 触发所述被叫用户的所述呼 叫等待业务包括: 在所述网元为接入网关控制功能实体 AGCF的情况 下, 向所述被叫用户发送等待音。
5. 根据权利要求 1或 2所述的方法, 其中, 触发所述被叫用户的所述呼 叫等待业务包括: 在所述网元为代理呼叫会话控制功能实体 P-CSCF 的情况下, 向所述被叫用户发送所述呼叫请求, 所述被叫用户返回振 铃响应给所述 P-CSCF。
6. 根据权利要求 1或 2所述的方法, 其中, 触发所述被叫用户的所述呼 叫等待业务之后, 所述方法还包括: 向所述呼叫请求的发送方回振铃 响应消息, 其中, 所述振铃响应消息中携带有所述标识。
7. 根据权利要求 1所述的方法,其中,所述网元为以下至少之一: AGCF、 P-CSCF、 基于 IP网络的语音传输网关 VGW、 会话初始化协议 SIP终 端。
8. —种接入网关控制功能实体 AGCF, 包括:
接收模块, 设置为接收从服务呼叫会话控制功能实体 S-CSCF或 应用服务器 AS发送的携带有呼叫等待业务的标识的呼叫请求, 其中, 所述标识用于指示所述呼叫请求的被叫用户是否支持呼叫等待业务; 确定模块, 设置为才艮据所述标识和所述被叫用户的状态信息确定 是否触发所述被叫用户的所述呼叫等待业务; 以及
处理模块, 设置为在所述标识为不支持呼叫等待业务的情况下, 向所述 S-CSCF或所述 AS回呼叫失败响应;在所述标识为支持呼叫等 待业务和所述被叫用户的服务状态为忙的情况下, 向所述被叫用户发 送等待音。
9. 根据权利要求 8所述的 AGCF , 其中, 所述确定模块还设置为在所述 标识为不支持呼叫等待业务的情况下, 确定不触发所述被叫用户的所 述呼叫等待业务; 在所述标识为支持呼叫等待业务且所述被叫用户的 月艮务状态为忙的情况下,确定触发所述被叫用户的所述呼叫等待业务。
10. —种代理呼叫会话控制功能实体 P-CSCF, 包括:
接收模块, 设置为接收从服务呼叫会话控制功能实体 S-CSCF或 应用服务器 AS发送的携带有呼叫等待业务标识的呼叫请求, 其中, 所述标识用于指示所述呼叫请求的被叫用户是否支持呼叫等待业务; 确定模块, 设置为才艮据所述标识和所述被叫用户的状态信息确定 是否触发所述被叫用户的所述呼叫等待业务; 以及
处理模块, 设置为在确定不触发所述被叫用户的所述呼叫等待业 务的情况下, 向所述 S-CSCF或所述 AS回呼叫失败响应; 否则, 向所 述被叫用户发送所述呼叫请求。
11. 根据权利要求 10所述的 P-CSCF, 其中, 所述确定模块还设置为在所 述标识为不支持呼叫等待业务的情况下, 确定不触发所述被叫用户的 所述呼叫等待业务; 在所述标识为支持呼叫等待业务且所述被叫用户 的服务状态为忙的情况下, 确定触发所述被叫用户的所述呼叫等待业 务。
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